[R] complex expression with plotmath

[Felipe Csaszar]

Thanks, it worked!

So the cute trick was the call to *quote* inside the function call.

Thanks again,

Felipe



On 8/14/05, Gabor Grothendieck <ggrothendieck at gmail.com> wrote:
> On 8/14/05, Felipe Csaszar <fcsaszar at gmail.com> wrote:
> > Hello everyone,
> >
> > I want to define a function that receives the name of two variables
> > (may include Greek letters and subscripts) and uses them into the
> > title of a plot.
> >
> > My best attempt is the following:
> > myplot <- function(var1, var2) {
> >    v=paste(var1,"==1 & ",var2,"==2");
> >    plot(1:10, main=parse(,,v))
> > }
> >
> > But when I call it with something like myplot("Q[i]", "Delta[j]") I
> > get "&(Q_i=1,Delta_j=2)" as title when I want to get "Q_i=1 &
> > Delta_j=2".
> >
> > Is there any solution within R? (I don't want to use psfrag and Latex
> > to post-process the plot)
> >
> > Why R does not have support for full Latex expressions? (as Matlab
> > f.ex.). IMHO plotmath is not good enough.
> >
> 
> Try this:
> 
> 
> myplot <- function(var1, var2)
>         plot(1:10, main = bquote(.(var1) == 1 ~ "&" ~ .(var2) == 2))
> myplot(quote(Q[i]), quote(Delta[j]))
>